Keystone Publishing Co., Philadelphia

In 1889 the Keystone Publishing Co purchased the printing office, bindery and two hundred sets of plates from John E. Potter & Co. This included the book plates for the T. S. Arthur titles previously published by Potter including "Ten Nights in a Bar-Room".

Keystone published "Ten Nights" in two formats. T. S. Arthur's Popular Works were printed in 1889 and 1890. The formats are identical to the Potter formats #8 and #9 ("Keystone Format" and "Sitting at the Table")

Keystone went out of business in 1890. Holiday Publishing Co. succeeded it.

The "Ten Nights" Keystone books have not been seen. Representative covers are shown below.

1889-1890